British health minister Nadine Dorries reveals being one of the first people diagnosed with coronavirus who had not travelled abroad was a "game-changer".
Ms Dorries was diagnosed with the virus last week and passed it on to her 84-year-old mother - both have now recovered.
On hearing of her diagnosis, she said: "I stopped listening for a second as the thought flew through my mind: my mum is going to get it and it’s my fault. I had brought Covid-19 home from Westminster and had unwittingly passed it on to her.
"It felt as though the clocks had stopped. I knew that everything was about to change and I wanted to hold time where it stood.
"This was a game-changer and I was at the heart of Westminster. I was not a returnee from Italy. I felt as though I were standing on the edge of a precipice."
The MP has been in self-isolation at home after becoming unwell with a cough.
Health officials have been trying to trace where she contracted the virus and who she has been in contact with.
She had attended a reception with Prime Minister Boris Johnson before self-isolating.
Speaking of her symptoms she told The Times: "My mum coughed repetitively and had a fever for one day. Last night we received the results of her test — she is positive.
"Unlike with my situation, we know exactly where she caught it from and the irony is, despite her having had major surgery to replace the valves in her heart damaged by childhood illness, despite her pacemaker and breathlessness, her lifetime of smoking, hard work in her early years and poor diet, she had much milder symptoms than me."
Downing Street has said there are no plans to test Mr Johnson as he has been showing "no symptoms" and had not been within two metres of the quarantined MP.
Ms Dorries, who helped craft the legislation to fight the virus, is the first British politician to have Covid-19 diagnosed.
The 62-year-old, who began her career as a nurse, has jokingly tweeted that she did not run out of toilet roll as the UK begins stockpiling the product leaving supermarket shelves empty.
Almost 1,400 people have now been infected in the UK as the death toll rose to 35 on Sunday.